> Seem promising.Thanks.> > x_array: Array of coordinates of x-position in the> channel> y_array: Array of coordinates of height positions at> the channel entry> velocity_array: Array of velocities at the height> positions at the channel entry> > How should I define x_aray? Can I define as> x_aray=[0:10:100]?> > Best regards,> Anne

The elements of "x_array" should have mutual distance at least max(y_array) such that no overlapping of the velocity vectors at different x-positions occurs(or you have to scale y_array by a fixed constant).